If you’re not already on the latest macOS, there’s a high chance that the issue is occurring due to a fairly common glitch that Apple has patched with a series of hotfixes. To take advantage of this fix, you will need to update your macintosh to the latest version from the System Preferences menu. But as it turns out, the issue can also occur due to a series of corrupted temp files (most commonly located in Caches and Calendar). If this scenario is applicable, you can resolve the issue by disabling Itunes sync and cleaning the contents of Caches and Calendar from the Library folder.
Method 1: Update macOS to the latest available version
As it turns out, this particular issue is mostly encountered on macOS version Mojave. As confirmed by some Apple engineers, this problem was since patched via a hotfix that is being pushed on every macOS version newer than Mojave. So if you’re encountering the “Couldn’t move your calendars to iCloud because an error occurred” error on a Mojave macOS, the easiest way to resolve the issue is to update your macintosh to the latest version available. Several affected users have confirmed that after doing this, the Calendar issue was completely resolved and they were able to use it normally. Here’s a quick step by step guide on updating to the latest version: If you’re still encountering the “Couldn’t move your calendars to iCloud because an error occurred” error or you already have the latest macOS version, move down to the next potential fix below.
Method 2: Clearing Caches and Calendar folders from Library
As it turns out, this particular issue can occur due to a series of partially corrupted temporary files that might reside in either Caches or Calendar folders (or both). Several affected users that were also encountering this issue have reported that they managed to fix the issue by the Finder function to access the Library folder and clean the contents of the two folders. But keep in mind that in order to do that, you will need to start by taking a trip to the System Preferences menu and disabling the iCloud integration with Calendar in order to be able to remove the files from the two folders. Important: If you want to ensure that you don’t end up doing any collateral damage, we recommend that you start by doing Time Machine Backup before starting with the steps below. Once you are ready to get started, begin following the steps below:
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